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Tofuko Awori Woyengo

Efficacy of new 6-phytase from buttiauxella spp. on growth performance and nutrient retention in broiler chickens fed corn soybean meal-based diets

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DOI

  • E. Kiarie, Danisco AS, University of Manitoba
  • ,
  • Tofuko A
  • C. M. Nyachoti, University of Manitoba

A total of 420 day-old male Ross chicks were weighed at d 1 of life and assigned to test diets to assess the efficacy of a new Buttiauxella spp. phytase expressed in Trichoderma reesei. Diets were: positive control (PC) adequate in nutrients and negative control (NC) diet (40% and 17% less available phosphorous (P) and calcium (Ca), respectively) supplemented with 6 levels of phytase 0, 250, 500, 750, 1,000, and 2,000 phytase units (FTU)/kg of diet. All diets had titanium dioxide as digestibility marker and each diet was allocated to ten cages (6 birds/cage). Diets were fed for 3 wk to measure growth performance, apparent retention (AR) on d 17 to 21 and bone ash and ileal digestibility (AID) on d 22. Growth performance and nutrient utilization was lower (p<0.05) for NC vs PC birds. Phytase response in NC birds was linear (p<0.05) with 2,000 FTU showing the greatest improvement on body weight gain (20%), feed conversion (7.4%), tibia ash (18%), AR of Ca (38%), AR of P (51%) and apparent metabolizable energy corrected for nitrogen (5.1%) relative to NC. Furthermore, phytase at ≥750 FTU resulted in AID of total AA commensurate to that of PC fed birds and at ≥1,000 FTU improved (p<0.05) AR of P, dry matter, and N beyond that of the lower doses of phytase and PC diet. In conclusion, the result from this study showed that in addition to increased P and Ca utilization, the new Buttiauxella phytase enhanced growth performance and utilization of other nutrients in broiler chickens in a dose-dependent manner.

OriginalsprogEngelsk
TidsskriftAsian-Australasian Journal of Animal Sciences
Vol/bind28
Nummer10
Sider (fra-til)1479-1487
Antal sider9
ISSN1011-2367
DOI
StatusUdgivet - 1 okt. 2015
Eksternt udgivetJa

Bibliografisk note

Publisher Copyright:
Copyright © 2015 by Asian-Australasian Journal of Animal Sciences.

Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.

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